Completed in September 2016, China's Pingtang telescope is now the world's largest radio telescope. Its dish measures 1,640 feet across and is capable of capturing signals more than 1,000 light-years from Earth.

Reuters

Nanhui New City, a planned Chinese city to be completed in 2020, will house almost 1 million people. Officials expect 450,000 people to move within the 107-square-mile area and 10 million tourist to flock there each year.

StoneCreek partners

After 17 years of construction, the Gotthard Base Tunnel opened in Switzerland on June 1, 2016. At 35 miles long, it's both the longest and deepest train tunnel in the world, offering unprecedented efficiency when traveling through the Alps.

Arnd Wiegmann/Reuters

The newly expanded Panama Canal was unveiled to the public in early June, 102 years after it first opened. It took $5.4 billion and 40,000 workers to triple the capacity of the waterway.

Reuters

In 2026, an Iraqi skyscraper known as "The Bride" will feature a "veil" of solar panels and produce as much energy as it consumes. It'll be 3,779 feet tall and contain parks, offices, restaurants, and a rail system.

AMBS Architects

Completed in 2011, China's Jiaozhou Bay Bridge is the world's longest cross-sea bridge, stretching nearly 26 miles — almost the length of a marathon. It cut travel time in half for people going between east China and the island of Huangdao.

Reuters

In 2015, the Itaipu Dam on the border of Brazil and Paraguay generated 89.5 Twh of energy, the most of any dam in the world. It supplies 75% of Paraguay's total energy and nearly 20% of Brazil's.

Reuters

London's Crossrail project — a massive upgrade to the existing Underground system — is the largest construction project ever undertaken in Europe. It involves 10 new train lines and connects 30 existing stations via brand-new tunnels. It will begin service in 2017, and be fully operational by 2020.

The Hong Kong-Zhuhai-Macau Bridge project will link three cities in China's Pearl River Delta — creating one mega-city of 42 million people — when it's completed in 2017.

Dubai's Mall of the World will be a colossal domed structure nine times bigger than the Mall of America. When it opens in 2029, it will be temperature-controlled, feature thousands of hotel rooms, and have its own transit line.

The Riyadh Metro, Saudi Arabia's new $23.5 billion rail line will boast a station designed by Zaha Hadid. Its 109 miles of railway will revolutionize how residents of Riyadh get around. It's set to begin operation by 2019.

Zaha Hadid Architects

Songdo, South Korea is a so-called "smart city" located on 1,500 acres of waterfront land. Completed in 2015, Songdo's near-comprehensive Internet access gives its 67,000 residents a taste of future society.

Courtesy of Gale International

Earlier this July, China and Nigeria agreed to a $11-billion contract to build the Lagos-Calabar coastal railway. It'll stretch for 871 miles and is expected to open in 2018.

CCECC

The South–North Water Transfer Project is an ongoing Chinese effort to move nearly 45 billion cubic feet of water from the Yangtze River to the country's less fertile northern regions. More than $79 billion has been spent on the migration so far.

Wikimedia Commons

In July of 2016, Norway announced plans to spend a reported $25 billion on a fully submerged, floating tunnel beneath the Sognefjord, a body of water more than 4,000 feet deep and 3,000 feet wide. It would be the first of its kind in the world.

The Norwegian Public Roads Administration

The 20-year Turkey Urban Renewal Project, a far-reaching plan to demolish some 7 million buildings and rebuild earthquake-resistant structures in their place, began in 2012 with an estimated cost of $400 billion.